Apple 16GB (4 x 4GB) DDR3-1333 MHz PC3-10600R ECC– Cloud Ninjas
Amazon.com: Timetec 4GB Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac (Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) SODIMM MAC RAM Upgrade : Electronics
DDR3 16GB Kit (4 x 4gb) RAM DDR3 1333MHz SODIMM RAM PC3 10600S CL9 1.5V 204 Pin Non-ECC Black Board for Mac/iMac/Laptop at Amazon.com
4GB DDR3 1333MHz RAM ~ for Apple iMac Mid 2010 & Mid 2011 Memory | eBay
Apple iMac 2011 Memory 4GB DDR3 1333MHz PC3-10600 204-Pin